@titangilroy They are called Slip Gauges. They are manufactured to a high surface finish, they also used as standard of measurement. When the gauges are “rung” together the air pushed out so they stick together.
@Engineering67 This is the most stupidity’s way to make a thread, screw cutting should always be done using a screw cutting tool/tip. This just knackers the tap.
@Tesco that’s the last time I use your “scan as you shop”.
84 item check, that tells me you don’t trust me round your store, if you don’t trust me to shop why put them out for people to use.